Malicious PDF — malware analysis report

Static analysis result for SHA-256 8305bea018cf8844…

MALICIOUS

PDF

32.0 KB Created: 2020-08-30 09:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea312218e03bbeff1444b891d6178ab1 SHA-1: eacd1d7682a5339d3eca647c0fe801646ddc91f7 SHA-256: 8305bea018cf8844af95527d753890f6dd7022d95571f2ce00afe18ea18ffa2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=picross+s2+p120
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/55174090241.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/restaurant_billing_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1854/files/amallia_action_logement_grenoble.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/dikepilubobokosole.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/7351870127.pdf
    • https://static.usrfiles.com/ugd/238140_276c5db8c14d490aaf96c72b043aa23e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e8d6012ea549288043a7e5f2d85829.pdf
    • https://static.usrfiles.com/ugd/ab922d_d48466f6b7e14faea03ad9ba650e5056.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc5fa4aef0642abb8432000f11f9378.pdf
    • https://static.usrfiles.com/ugd/f523c3_fd83004e083b4326b17e16d1bac07a73.pdf
    • https://static.usrfiles.com/ugd/e32576_e61038ca2bf04aa581ddf1f84aba8964.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b8bbc683a8c64c14aa49ee07bf1d6d0b.pdf
    • https://static.usrfiles.com/ugd/23e9be_3e7594daead341378d6bdb34d517d2ca.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041ae.bin
0bea06475a4ce8774cd30f582f7ddc2252b743d63d535c01e1c17868aabcc008
pdf-font-stream PDF embedded font (sfnt) at offset 0x41AE 5012 bytes
font_01_sfnt_off000052d2.bin
2c21a73b77a1127a9a7b23695c517b982be2aef027de870571b2fa8f98afa92f
pdf-font-stream PDF embedded font (sfnt) at offset 0x52D2 9640 bytes